List of free playground tool/service for developer👇🏽
JSFiddle
Test your JavaScript, CSS, HTML or CoffeeScript online with JSFiddle code editor.
Tag: playground
Projects and code are public by default Full-stack apps that sleep after 5 minutes Unlimited static sites that are always on Github import/export and Prettier support
Codesandbox
Where teams build faster, together. Create, share, and get feedback with collaborative sandboxes for rapid web development.
Tag: IDE, playground
Free for individuals ✓ All Platform features ✓ Public sandboxes ✓ Personal workspace
Unlimited public Pens and Collections Unlimited templates Debug view (requires log in) 1 project with 10 files
csplayground.io
Bring self-paced interactive coding courses to classrooms. Build your own lessons and monitor students' progress.
Tag: playground, education
All courses Create custom course Classroom management Student progress tracking 5 students
Flatbase
Query your CSV and JSON files with SQL. Flatbase is the data science platform for developers. Upload files, write SQL, visualize results, and share with collaborators.
Tag: sql, json, api, playground
Up to 3 workspaces Share with up to 3 teammates
Trinket
Share Code from any Device. Trinket lets you run and write code in any browser, on any device.
Tag: course-builder, teaching, playground, web-development
Unlimited Basic Trinkets Python, HTML, GlowScript, Blocks and more Quick, Simple Sharing Remixing Customizable Code Editor Downloadable Code Free Activities Custom Courses
SQL Online IDE
User-friendly interface for data science. No registration for start, No DownLoad, No Install. Online test SQL script.
Tag: sqlite, mysql, database-gui, playground